This really should've been Cc'ed to me. On Thu, Feb 15, 2018 at 03:19:42PM +0100, Christian König wrote: > diff --git a/include/linux/ww_mutex.h b/include/linux/ww_mutex.h > index 39fda195bf78..dd580db289e8 100644 > --- a/include/linux/ww_mutex.h > +++ b/include/linux/ww_mutex.h > @@ -358,4 +358,21 @@ static inline bool ww_mutex_is_locked(struct ww_mutex *lock) > return mutex_is_locked(&lock->base); > } > > +/** > + * ww_mutex_is_owned_by - is the w/w mutex locked by this task in that context > + * @lock: the mutex to be queried > + * @task: the task structure to check > + * @ctx: the w/w acquire context to test > + * > + * Returns true if the mutex is locked in the context by the given task, false > + * otherwise. > + */ > +static inline bool ww_mutex_is_owned_by(struct ww_mutex *lock, > + struct task_struct *task, > + struct ww_acquire_ctx *ctx) > +{ > + return likely(__mutex_owner(&lock->base) == task) && > + READ_ONCE(lock->ctx) == ctx; > +} Nak on that interface, that's racy and broken by design. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel